Configure the Exchange server to support Compatible mode
by using the instructions from KB article 980436
. This allows the Outlook for Mac client to establish a connection by using the SSL protocol and then renegotiate by using TLS. This method allows Outlook for Mac to connect to the server even when SSL 2.0 and 3.0 are blocked. If you are using a security product such as Microsoft Forefront Threat Management Gateway (TMG) for managing connections to Exchange Server from outside your company, you will need to configure your TMG server using KB article 980436
. External connections to Exchange Server may be blocked if this server is in Strict mode
Do not configure the server to use Strict mode, as this prevents the Outlook for Mac client from connecting to the Exchange server.